SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47ad55bd270367c6713e42d8649d5f6f54f92a4735d8712453710c8a3a2cdf5' 
  AND token = 'wBilHUPxNjD3WFpFx3Zrf/btvEtrf3/M0+G6aK/dB9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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