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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e6a3a2ab9c8e1c2149f4bd9938dc632c1020a1df48b61a069b1d6ac5a99848' 
  AND token = 'fUtxs7NakBaEJqPusuQCcxmviX0dxBUsqwPD4LvXkms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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