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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483c2490ea3dcbe28e0cf1b5199b8d13a758e15a2d403d2ae1ef1f8a28a70c0a' 
  AND token = '2DkHFJHbqgFwqtJkdi9M3ENwxxnE5DsncZT1qIw6tSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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