I just got done dealing with millions of mites on my breeders. But those were flour/grain mites. Had to dawn dip all the rats and then bathe them, put them in a clean enclosure, then bleach everything, froze their food, theor new bedding, boiled the eco earth, and now they're set up again. Oh, and I washed myself down, froze the clothes I had been wearing, etc.
Keep it as a rescue. Soap it, soak it, and keep it in another room from your snake. Either breed it or keep it as a pet. Don't forget to isolate everything it touched, including yourself. Wash everything, bleach, or bug spray is a good idea. Get the rat some mite killer.