SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d998294ba4bd133af54b5cc33e16b5cabf701d9407a61640a106f55694bd510' 
  AND token = 's+pn0mujArOJrAeJJ/QhuZ2GlIi5KV1xOUvLOSYNcNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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