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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010893e678890edc7abde09397433096e593cedf533dd7d47b420e7bd263f3b9' 
  AND token = 'dfa9NFYTu5hhrJySjfgQh6u23q29WwWx87ISRVkzXyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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