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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e765fce3001a0130c0064ba85ea081a3629a0921ed106d9799eacbfda02c66ae' 
  AND token = 'AYoeBSuM4Ct8cv7Se3VvQ05fMQHtxfC3xyF0R9jT5A4=' 
  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