SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd662f2c2520c24449ebdd8026cadb532a2f2930367f065081391729c6edc080d' 
  AND token = 'RYVB+OW4UGe2CKxs36QeHD7/Y7vRAqY/BAt+uKnaNDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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