SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8354d67439a62f93d0fce7b4c586e1948e365c5b259654068f3cfff123be1086' 
  AND token = 'KogXDXh+/pLMPzkWnXa3Xg/TC+pZZByeheB4FNbCffk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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