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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e02f85d08e8f807a3c20c04d898923bf69420ce98ef405b0f918e1247aae2c' 
  AND token = 'Dn+fiXxMcNmpPmZob27LuE/CdU3QZFLSLL99B6iIihU=' 
  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