From what you have said it seems as if you are doing everything correctly. But, I have a question or two. How deep did you plant the seeds? When you spray water on the soil how deep does the moisture go? At time of planting did you completely wet the soil? You said the room was warm but what is the temperature and are the seeded containers on a heat mat? You said about a week ago. How many days is that?
My tomato seeds sprout between 3 and 7 days depending on the variety. I try to keep the soil temperature between 78F-82F. Before planting the seeds I completely saturate the soil. I put the seeds on the top and sprinkle about 1/4 inch of soil covering the seeds. I gently pat down the soil making good seed to soil contact. I then spray the dry soil on the top until moist and then cover the containers with Saran Wrap. By doing this I never have to water until the seeds sprout. When they sprout I remove the Saran Wrap and put the sprouts under artificial light. If yours haven't sprouted within 10 days I would start over.