SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285d6284a3c9c70e8b9079b7016157beba2a4a2ed54e865209c1946728af6cca' 
  AND token = 'yFEyaUW9uK18cVLqsjVqY3gNMZs9ce9+QpqXVXwTyS0=' 
  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