SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f61bca13d6a54b7f540797bff2dbc0e730e8f758d1be8401ebc8a5fb3592b64' 
  AND token = 'GgpmqPuU/9YR1Jl47L+uW+wIpV7jk4FRiFSGgGkq+d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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