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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08327236c4eea0eddfaf768f2923609036d6b64953e5d53d7b7f09eb4b76b3bb' 
  AND token = 'A8TNDMDn+vp990HIiSf5rNr7/mqTX6jsnI/Evsn6ZOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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