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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8556d9edb27f835d8ddcc578da90c29399996bbd955b7f6285f5c96b5dd9ae' 
  AND token = '+bTnckUDlNLkoLfuwJ99vngVuX+b5SYsqdrm0wtHRTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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