Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016cf4338c3d7e7dc395b23335497f4054ee5aa9d7dffe2b38a89207feb839e3' 
  AND token = 'dS8FdtB2j338Tt45rtWwr0WBwaX8m6PArFlFiAaECB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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