Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101c7b1aa218078a0bc5595805d6bf917315e80fbc68fc39c3968cf5ca227c50' 
  AND token = 'u8oOsQzFUvRDijztAe7JAflUOzNDPaMucABpkxJo27E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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