SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a956579cfbccfa4d9adbb338bd9df1d8fb2e796fbbbab5e6a2c1f7cc9b8b22f7' 
  AND token = 'C9R83slbCyTDEeqrGoiWTQMa/3u92yX/DXhEHbzeeHs=' 
  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