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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb5ef775afa8e94e811ed214ba106476913ba50df888f6104422125a8b953f2' 
  AND token = 'Q91ALd8qo6AuiHOKZIw8YbOfrSgZwJCX4zleZekHGGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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