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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d126dc602edaf67e2440eee93855827a46b9b31c12d21dc87c540f7f3e65166' 
  AND token = 'ihrpxQEbvl4BHvLotax7rH8Wn7hGP6CLde3AZtTVxSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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