SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3695f038a9339244bcf7734f3c549f23b1f2443e9c0b8446f5300147d6e7e99f' 
  AND token = 'sUzXlQMW4bY8V7d1DQmSZP7jJ/rhlPZRwHajmkgjTrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}