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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f42ccee58e9dbb7de5c5e53ede1d53dc024a9a26dd43387ef50ac748fc99ff' 
  AND token = '6hTlicwq8GFrz+zMWzyLOZEUu/wf4PG8FaToyeMNBF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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