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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a38b9170aa695196a42b0512175a18105acfc207bf8fc1c118b96798ed5dddb' 
  AND token = 'C2jFl3YT1SY8HsscdOwX3nxDKEuNNdabLSWRjG3PcLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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