SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4d1964bcd114ac83644685a3288164cb9c1b6f1bb75bbdc3af704d7acc5e5f' 
  AND token = 'EyjGjVIUS/EtoY1mpDLgmjsMbY/hsizKpXJBPn4FJd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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