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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08236a417e7b21fd3b565db6642e04d362b9e32d493a6cbf822c34db93edaf8' 
  AND token = 'FgnXqQ3u7t6FKuBEKvVz48YqmctncIiuWb8g0RvZyik=' 
  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