Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844cf71857f3bbdc0b9f374b1c321bafcac93da2724071372d0d4fc93d509fe8' 
  AND token = 'FeNy3FEbtm0wlUgg9MCnncGAlcempzdHtlFLFEyo8n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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