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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd252c1e37a82acab26b32d4403c49824f6ceb1cb38e4db086f07b9a242d36a66' 
  AND token = 'OqmRsPger9XNM7IwOzI4lJ6pWkWO+6/bJ62nXBS7C7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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