Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5062301249a878255b22bec0dffa4952511f6da255bdf5ded1a6fe35076141' 
  AND token = 'BkBz57CC0ORTrTTqjqhkmTwy2Pa44agQVSCvFmbiQHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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