Yes the plant will survive at 90 degrees. Measure your temperature from the canopy level where the light hits the tops of your plants. Try to cool this area if you can by having oscillating fans blowing across the canopy directly under your lights. This will help. Also, test the ambient temperature outside your room. If it is lower then the temp in your room then you know that you can lower your room temp by moving more of that air through your room.
Your plants will be fine though. Some sativa dominant strains prefer warmer temps and they may actually like it a lot especially if that is the temp they have been grown at throughout their whole life. Try to keep things as cool as possible for the best quality trichomes though.