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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7ba4b1fc03246414c45073832fb51cd82c63bc7f35c0408aa392bbd203dd41' 
  AND token = 'pcTMgh9EzoCoWOgAkGKJ/gooC3sUYsIo7eOuV7s/Kks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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