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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074eaea6d5c98df69193ab853c4092b83837b6c408aa6ba06703ee882594acdb' 
  AND token = 'UDLRlLJJBds8WnnRlCnwvvVbFF8plmjwNR6KbiqURQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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