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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113dc71806d8183609815ed33e166918cf9f148223961d87baa3c56ece5c7686' 
  AND token = 'ZLTw138ZbwKKVC689fei9SucDl6L0I6v2U9xwkNMatU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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