SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7536b190799c1c3cc75eb10739498f70db359fd41c86aef6942ccc26e3696168' 
  AND token = '54NIXlUUKB8ZuSwLm9A8vqBub/QghTfxJ1q/5D+W4WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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