SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1894f322b2fe23db73a6e6c19f0bdf787efa05209cf4ea58e682e41468dccf9' 
  AND token = 'TEQprzayY3zMAVds1Hk+CJ1L7Sjj9OfJBu5hJRP7EOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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