SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6726878d9045bf7c872203cfff21081002384bb1f83a70c7f7a34cfe33c25e8' 
  AND token = 'fJSVOuhzXNg3qKhgz4J13tCM3AsNJu+J97T9UZVjdbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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