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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a4e3f03f70fa8c07ca049cbbc1c6b947fe0bc848aaed20a0cb68bcf07c07b7' 
  AND token = 'Fpf6sf65fos2IlI5L602cQBiJFVRUYwwtlsrKh8AOnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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