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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61570f8e7645f0493bb8b466fbd34468ac3b5fc845c9ddc09460abd2574fae3c' 
  AND token = 'tQBfmeXwRABHTxcRkAo8TygoJVmg2zoXVmb6QZlyL4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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