SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632390c3dc896149cfa6ba1b1786ad52ef746225b60889688ad0824a23921438' 
  AND token = 'IzOGVvJ4f4YbC0v86OAMh/vx+RZzwcVzn+HnF4Zmy7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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