SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc72027e99ea6368f05fb54134f0296a4d5d52b4118652e8f589614b23c4805' 
  AND token = '9Zt8/7+WwHpO9iJLpGz/cA9+jtKna/xtLuusLZ8GmCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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