SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b6f339740482d9d69ed6246c0f177d4c50a8e4467aba5985ef064c3e1889c8' 
  AND token = 'mDWzwH2lJKOFCLo2PqlbPaZX5Tp7dxsAO+/90HjGrW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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