SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf63efcecd9cb5358dae5d7ff0f16f1bf112716b3258421dd987a27f9dd79c63' 
  AND token = '95vFBQ1qzTuL42VlZjhC6WJKFJGgKrDU6JtjNgWTSzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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