Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c005bf5025349dce0667ab5c90f32d14c7a42396a5ad267c756ecf2ed13c12' 
  AND token = 'QbogvLCHj0kw2cslMqnq6RuVAAJqY0qH5C3RhGTaWH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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