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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070356a10eceb4dd70ac536d10fef4cf6a4f6ed5d87f027688381759f38b6d07' 
  AND token = 'CoI7hKduBM7PUOSiYwvsDTqgF2NrGEpSualT9PYI7zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

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