SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988e0cf0395a0327cf97ae30f4f65cb040112d7322542f6acaa26491140471bf' 
  AND token = 'IYafTFYiy6xYGrrWzVbFA5fTyzd331GYuN9cL/TAI6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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