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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68e06f6b732c8a18e932f28f02c8723c6c51aca2eaddc3994d03f209a5d7818' 
  AND token = 'aURTdy4brZuORGrADpOVgJp8UG9tseQtNZTdK3ZDLmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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