SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11be09311e5e26b00488df6aa72a4ccd6eb9d5478fbc9ea2208f3505ff258358' 
  AND token = 'Db9zcqcpwjZRig70dYkYKJBlEWtRvW4wNFiZ/YpIJ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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