SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3c0de0fdbc45a079d78cf5fc0af8c11acb030f53632eafc83d7ecb8b6dd374' 
  AND token = 'E485RTqIWmRp6d/P0tzi+l6e6VGxuRGor4OSF+ZYKe4=' 
  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