Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2faa94b0070e56020e18db8166427895ec6cb8cc92d0f62401744a91b122eac' 
  AND token = '3farneYuyURPRr13WBvkB5Dto2MjyRI7ZXuiA+NoB88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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