SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70c0574c30bf49342bfe1193d46c92af6dafc9fcce2ad9d10104f96086aeaaa' 
  AND token = 'FPx1Js3JZWME+j6jPcPyOVIJgBB63lOUf7bIwgV7LE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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