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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df5fc82ff4f27d146e7737cdee9aaf39fd474984669ed0f938ed126634a5f23' 
  AND token = '/wJlT1ynyOSuY6IRMTpEySUGnzVvUyzytunU7En/5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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