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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6021d24e54985a27482ed55e4516399863908684ed0b15f1499df2eed6dfb8dc' 
  AND token = 'N0tm+okdtUea2j8Ed4es8mo69eaoJHqTQEXG9I8Oy3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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