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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456a8e76f923a1219779b49535430798d59d6a7408f603ee330fd5d23ba61881' 
  AND token = 'faAg92Zeos43eJMficlJ2PMOF3lBl6skhJwYz0tSwc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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