SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8faf428748fcf7b94db96b915e8367afb1a6f80e4f3f11c44cf0a53b31e737cd' 
  AND token = 'BYwuZuMSpk/4xD5UFqGPbOFXtW15XJuwtJOvszXDogQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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