SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088c92688654d083ded3f769360706e1fa56424f8c6cc69cbaf590ed12bb37a9' 
  AND token = 'TrI+CpJ13WKsaPx1dCGjdNPcFvH3HXEFqr+TCJFzZog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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