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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3564374eb1d09490ca714c6161f85c9ac7bd00ea1277f36c8933d6073a7f91cf' 
  AND token = 'UhqRSS7BMmKr52p8D6b7SlBuMQaVidjBW1euzjKigaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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