SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627dc87288795dbef3825155b07a57dfc17feb9c092360b29cc6e3615b2fca86' 
  AND token = 'xkHZBNFKOD74A/Szw51gVPJdgvCEydCIIzJq71GBQ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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