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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4cd5b430ded24ca586cb1fbce2f739d951e9748eed6b00b554a008a0597466' 
  AND token = 'xDfGfZS60Z9vZmaCDrhhPkKWlXEGo1J457NZPsSkE2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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