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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41dbe3f5df3f2395d89ca84192ecdbf69c93b9b51ad8d254dd3e036201b9c6b' 
  AND token = 'ZK5+rsyYWDS0+DENfc1IdzIeDWd4lvrtXxJCYvjdE8E=' 
  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