SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b81c8e289563a161b091813a95c2cccd8ef1fb8f602f69b92d9ac074d7d6f5' 
  AND token = 'ja4Gg6ahYdlsQSrbdM3P53P/WDZ3wuyZqpMVYxVur+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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