SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf01cefebb3d194f21782b615ed01eb021c793cef1372daff34cb8a2639efc6' 
  AND token = 'ADRPVTmGPZ2QdLUvoCdeSIoDoNujwh++rzB7kJl71Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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