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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2055385f37315e68efe868364f8aaae36ac31455b72dcc90101da56cbc0ee8' 
  AND token = '/GpQb31hYKUEdyfc+uCVvXkXh2pnFAtiF3gcgv2nv90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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