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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2b39351ccdb1239f999ead9e6fef2e26b8d78f8eeaa181fc7ec23fc97b99c4' 
  AND token = 'UupUw0lgRDoorbfTu5L0V2VJebtDdbsBff5W9wYxXaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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