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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16be1cd352eaf91ca11a12e44b36e7a5d15a1f6b3f8b933fca71e2e52e1af3f6' 
  AND token = 'ZqpBsUNSzBpXgmX2MQtMMASBm87RsXPctNyWqzrw6Dw=' 
  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