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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84277a8caab43477001d06f1c482573dc303c063b43a053174b44cf1ad4abbac' 
  AND token = '+CLoCRh94mpdQhPboed4OfDKYNsfPIOY0tkNZDzbZ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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