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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a105201c0003e1f736adf9570129b8020f870d5957f4cd0459432eca8c30ce1f' 
  AND token = 'nzMwG0pYehhkGTwM8EjpKuq0QBKtg3A8mgURiNn9xkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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