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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1298be5c01d9be16fbffe04c6b9beed6a5d9a548346fc045f6df820b936f233f' 
  AND token = 'cbzS5PO8lA92S/9Jg+xW6bU9cTVX6r2bqfoYDhEtjEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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