SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c154a3c98903d36e7f0d56f7591d063b05b4fcc28511d4d6194ced9ccdf1ca6' 
  AND token = '85GLNO7Han/VsyYOVSepta6BVJbjyQ6B/ugYyUniYtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables