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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2411494429b7a37f6ce0ec4a700c6ee30d389d00387ac5156446b4403bce84' 
  AND token = 'n7Ux7GCgGWBrUwz9DRBVhRFdbxAtxNxKXwcOIMPUW0k=' 
  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