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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c2ca565a00124be0dea6c830d7db357cfa02bc1795a9dcd26c2bb84448e6bf' 
  AND token = '+UOmPnE085jSt1v9aocMxq2GIUp5iGdTo91CnkK7R2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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