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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aeb03eaad887efd3b85d7fa177cb712c4e08f8510f07a053bf4a0e4aab296c' 
  AND token = 'VlCcDtPIo0OLnUIvUGjMo7XeD9zluVeUumDjBrqJNhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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