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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8819cead04545f1ec127365ad2d7aad1fb71f033b529aa22ff1be40b609b9027' 
  AND token = 'mgnLWBza9HM+mMGNUiV24bF2doYKVioUkx+j3pDRC0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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