SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f520b522e51ca39c0ee231b677819b095536f13963e04c3f84857bdc3068f00' 
  AND token = 'OEiy7qr+VE6tAPSQxv/xRuKLpQ2zaH3pLotHRh6BwRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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