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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde97d81af0ec3911439b856a05dd09dcd0e1a7e4d45ccccd6446c2f4ed9b93a' 
  AND token = '8QG79qOjegNCwFi5liccqhK8KCLAD89PoHQS8czfPks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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