SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6690e315fd514e7d437372d9c43e5ee2cecf70e1fd0eb38685138e69ce365eca' 
  AND token = 'IALKvJ4J5ENwP1azVmFnQofMyRDU+OhzeeB71xfeJMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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