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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01b8e101a6b3cce59eca14232ab0be1c24f05804c45838f3caa1b4d4c71208f' 
  AND token = 'LUlXhjwUnDGBZYuZHNZaPgCFbRtsApsNpzDgNiuuZxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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