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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6216c28a5c995b32009d7b6a5077430b0a8d905e3f10e12a97bbc083510ce9' 
  AND token = 'dMEEKBlQRphkyV/jdzJuXn2LaYD9oPR5TxF4D/cRiks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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